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21. 发明授权

US5528191A Logarithmic amplifier having improved speed response 失效
标题翻译：具有改善速度响应的对数放大器
公开(公告)号：US5528191A
公开(公告)日：1996-06-18
申请号：US527202
申请日：1995-09-12
申请人： Hiroaki Yasuda
发明人： Hiroaki Yasuda
IPC分类号： G06G7/24 , H03G7/00 , H03G7/08 , H03G11/08
CPC分类号： G06G7/24 , H03G7/00 , H03G7/08
摘要： A logarithmic amplifier includes an operational amplifier, an element for logarithmic conversion purposes connected to a feedback circuit of the operational amplifier, an oscillation prevention circuit having a capacitor connected in parallel with the logarithmic conversion element, and a control circuit for controlling the oscillation prevention circuit in such a way that the amount of feedback by way of the oscillation prevention circuit is reduced as an input current to the operational amplifier becomes smaller. To improve the high-speed response characteristics of the logarithmic operational amplifier, the operational amplifier is made up of a composite amplifier consisting of an FET input type operational amplifier and a bipolar input type operational amplifier.
摘要翻译：对数放大器包括运算放大器，用于连接到运算放大器的反馈电路的对数转换目的的元件，具有与对数转换元件并联连接的电容器的振荡防止电路，以及用于控制振荡防止电路的控制电路以使得通过振荡防止电路的反馈量随着到运算放大器的输入电流变小而减小。为了提高对数运算放大器的高速响应特性，运算放大器由一个由FET输入型运算放大器和双极型输入型运算放大器组成的复合放大器组成。

22. 发明授权

US5525924A Log conversion circuit 失效
标题翻译：日志转换电路
公开(公告)号：US5525924A
公开(公告)日：1996-06-11
申请号：US306367
申请日：1994-09-15
申请人： Takashi Ueno , Mikio Koyama , Hiroshi Tanimoto
发明人： Takashi Ueno , Mikio Koyama , Hiroshi Tanimoto
IPC分类号： G06G7/24 , H03G7/08 , H03G11/08
CPC分类号： H03G7/08
摘要： A log conversion circuit comprising first and second input terminals to which voltage signals are input, first and second resistors, first ends of which are respectively connected to the first and second input terminals, first and second PN junction element sections connected in series and in opposite polarities, between a second end of the first resistor and a second end of the second resistor, a biasing circuit connected between a first source terminal and a node between the first and second PN junction element sections, first and second current sources for determining potentials at both ends of the first resistor, the first current source means connected between the first end of the first resistor and the first and second source terminals, and the second current source means being connected between the second end of the first resistor and the first and second source terminals, third and fourth current sources for determining potentials at both ends of the second resistor, the third current source means connected between the first end of the second resistor and the first and second source terminals, and the fourth current source means being connected between the second end of the second resistor and the first and second source terminals, and first and second output terminals for outputting voltage signals generated in the first and second PN junction element sections.
摘要翻译：一种对数转换电路，包括输入电压信号的第一和第二输入端子，第一和第二电阻器，第一和第二电阻器的第一端分别连接到第一和第二输入端子，第一和第二PN结元件部分串联连接，在所述第一电阻器的第二端和所述第二电阻器的第二端之间的极性，连接在所述第一和第二PN结元件部分之间的第一源极端子和节点之间的偏置电路，用于确定第一和第二PN结元件部分之间的电位的第一和第二电流源第一电阻器的两端连接在第一电阻器的第一端和第一和第二源极之间，第二电流源装置连接在第一电阻器的第二端和第一和第二电阻之间源极端子，用于确定第二电阻器两端电位的第三和第四电流源，第三电流源电流源装置连接在第二电阻器的第一端和第一和第二源极之间，第四电流源装置连接在第二电阻器的第二端和第一和第二源极端子之间，第一和第二输出端子用于输出在第一和第二PN结元件部分中产生的电压信号。

23. 发明授权

US5507022A Electric field level detecting apparatus 失效
标题翻译：电场检测装置
公开(公告)号：US5507022A
公开(公告)日：1996-04-09
申请号：US297225
申请日：1994-08-29
申请人： Yasutomo Uomoto
发明人： Yasutomo Uomoto
IPC分类号： H04B1/16 , H03G7/08 , H04B1/26 , H04B17/00
CPC分类号： H03G7/08 , H04B17/318
摘要： An electric field level detecting apparatus includes an intermediate-frequency signal generator, an intermediate-frequency amplifier, an analog voltage generator, an analog/digital converter, N converting tables, and a control circuit. The variable attenuator receives an intermediate-frequency signal from the intermediate-frequency signal generator as an input and changes a passing attenuation value in accordance with an attenuation value set to be changed at N steps (N: arbitrary natural number) by a first control signal. Each of the N converting tables prestores a relationship between a digital voltage and an electric field strength of a radio frequency reception signal corresponding to the attenuation value set in the variable attenuator and converts the digital voltage from the analog/digital converter into an electric field level signal indicating a corresponding electric field strength to output the electric field level signal. The control circuit outputs the first control signal for setting the attenuation value of the variable attenuator to be changed at N steps on the basis of the digital voltage from the analog/digital converter to select one of the converting tables in accordance with the attenuation value set in the variable attenuator.
摘要翻译：电场电平检测装置包括中频信号发生器，中频放大器，模拟电压发生器，模拟/数字转换器，N个转换表以及控制电路。可变衰减器从中频信号发生器接收中频信号作为输入，并根据设定为以N个步进（N：任意自然数）改变第一控制信号的衰减值改变通过衰减值。 N个转换表中的每一个预先存储与可变衰减器中设置的衰减值对应的射频接收信号的数字电压和电场强度之间的关系，并将来自模拟/数字转换器的数字电压转换为电场电平信号表示相应的电场强度以输出电场电平信号。控制电路根据来自模拟/数字转换器的数字电压，输出第一控制信号，用于根据来自模拟/数字转换器的数字电压，将可变衰减器的衰减值设置为N步，以根据衰减值集合选择一个转换表在可变衰减器中。

24. 发明授权

US4459557A Compressor limiter for audio signal processing 失效
标题翻译：用于音频信号处理的压缩器限制器
公开(公告)号：US4459557A
公开(公告)日：1984-07-10
申请号：US345653
申请日：1982-02-04
申请人： Mark A. McQuilken
发明人： Mark A. McQuilken
IPC分类号： H03G7/00 , H03G11/00 , H03G7/08 , H03G3/18
CPC分类号： H03G7/004 , H03G11/00
摘要： A compressor limiter is provided for the processing of audio signals. Fundamentally, the invention includes an amplifier receiving audio input signals and including a photoresistive element in the feedback circuit thereof. The output of the amplifier is provided to a dual stage control voltage generating circuit. The first stage generates a current through a light emitting diode corresponding to the amplitude of the output signal from the amplifier. The light emitting diode sets a threshold for suppression of the output audio signal such that, as light is emitted from the diode, it effects the photoresistor in the feedback circuit of the amplifier, thus adjusting the gain. The other branch of the control voltage generating circuitry comprises a peak detector which is operative for controlling the light emitted from the diode when successive audio signals exceeding the threshold are received in rapid succession.
摘要翻译：提供压缩机限制器用于处理音频信号。本发明包括在其反馈电路中接收音频输入信号并包括光致抗蚀元件的放大器。放大器的输出被提供给双级控制电压发生电路。第一级通过对应于来自放大器的输出信号的振幅的发光二极管产生电流。发光二极管设定用于抑制输出音频信号的阈值，使得当从二极管发射光时，其实现放大器的反馈电路中的光敏电阻，从而调节增益。控制电压产生电路的另一个分支包括一个峰值检测器，该峰值检测器用于控制从二极管发射的光，当连续的音频信号超过阈值被快速连续地接收时。

25. 发明授权

US4091295A Transistor circuit 失效
标题翻译：晶体管电路
公开(公告)号：US4091295A
公开(公告)日：1978-05-23
申请号：US730629
申请日：1976-10-07
申请人： Hisashi Yamada , Masayuki Katakura
发明人： Hisashi Yamada , Masayuki Katakura
IPC分类号： H03F3/18 , H03F3/347 , H03G1/00 , H03G7/00 , H03G7/08 , H03K17/00
CPC分类号： H03G1/0005 , H03F3/347 , H03G7/002 , H03G7/08
摘要： The collector of an NPN transistor is connected to the inverting terminal of an operational amplifier to cause a collector current of the NPN transistor to be inverted by the operational amplifier. The combination circuit of the NPN transistor and operational amplifier equivalently works as a PNP transistor.
摘要翻译： NPN晶体管的集电极连接到运算放大器的反相端，使NPN晶体管的集电极电流由运算放大器反相。 NPN晶体管和运算放大器的组合电路等效地用作PNP晶体管。

26. 发明授权

US3368158A Low-level automatic gain control circuitry 失效
标题翻译：低电平自动增益控制电路
公开(公告)号：US3368158A
公开(公告)日：1968-02-06
申请号：US45571465
申请日：1965-05-14
申请人： BELL TELEPHONE LABOR INC
发明人： BROWN WILLIAM J
IPC分类号： H03F1/26 , H03F1/34 , H03G1/00 , H03G7/00 , H03G7/08 , H03G11/00
CPC分类号： H03F1/26 , H03F1/34 , H03G1/0052 , H03G7/001 , H03G7/08 , H03G11/002

27. 发明授权

US3289107A Compandor system employing symmetrical varistors 失效
标题翻译： Compandor系统采用对称压敏电阻
公开(公告)号：US3289107A
公开(公告)日：1966-11-29
申请号：US30021763
申请日：1963-08-06
申请人： AUTOMATIC ELECT LAB
发明人： ZELLMER NEALE A , WU GEORGE S
IPC分类号： H03G7/08 , H04B1/64
CPC分类号： H04B1/64 , H03G7/08

28. 发明授权

US11736081B2 Audio enhancement in response to compression feedback 有权
公开(公告)号：US11736081B2
公开(公告)日：2023-08-22
申请号：US17255329
申请日：2019-06-20
申请人： Dolby Laboratories Licensing Corporation
发明人： Timothy Alan Port , William Thomas Rowley , Winston Chi Wai Ng , Sebastian P. B. Holzapfel
IPC分类号： H03G5/16 , H03G9/00 , H03G9/02 , H04R3/04 , H04R1/32 , H03F3/20 , H03G7/08 , H04R1/08
CPC分类号： H03G5/165 , H03G9/005 , H03G9/025 , H04R3/04 , H03F3/20 , H03G7/08 , H04R1/08 , H04R1/326 , H04R2420/09
摘要： In some embodiments, a method for performing enhancement on an audio signal to generate an enhanced audio signal in response to feedback indicative of amount of compression applied to at least one frequency band of the enhanced audio signal. In typical embodiments, the enhancement is or includes bass enhancement. Examples of other types of enhancement performed in other embodiments include dialog enhancement, upmixing, frequency shifting, harmonic injection or transposition, subharmonic injection, virtualization, and equalization. Other aspects are systems (e.g., programmed processors) and devices (e.g., devices having physically-limited bass reproduction capabilities, such as, for example, a notebook, tablet, mobile phone, or other device with small speakers) configured to perform any embodiment of the method.

29. 发明申请

US20200084542A1 TEMPERATURE DETECTING AND CONTROLLING INTEGRATION DEVICE AND THE TEMPERATURE CONTROLLING METHOD APPLIED FOR MICRO SPEAKER 审中-公开
公开(公告)号：US20200084542A1
公开(公告)日：2020-03-12
申请号：US16682454
申请日：2019-11-13
申请人： Xiamen Fourier Electronics Co., Ltd.
发明人： Xuexin DING , Weiji LIU , Jian XU , Lin ZHANG , Xiaolei LIU , Yingshun JIANG , Fangkang SHEN
IPC分类号： H04R3/00 , H03F3/24 , H03F3/183 , H03G3/30 , H04R29/00 , H04R3/04 , H03G7/08 , H03G7/00
摘要： A temperature detecting and controlling integration device for the micro speaker is provided. After the filter receives an input signal, the power amplifier adjusts the power amplification, and the multi-frequency detection signal is generated with the waveform generator. The extracted signal is generated to drive the micro speaker to emit a sound signal. Afterwards, the voltage signals are extracted at two ends of the coil and the temperature signal is obtained by converting, capturing, and integrating to pass the temperature value to the external device, and the temperature value of the non-linear temperature-controlling unit is analyzed to adjust the compensation gain in real time. The smoothly control of speaker temperature and stable playback of the sound signals is played that can be achieved.

30. 发明授权

US10218319B2 Radio frequency (RF) amplifiers with voltage limiting using non-linear feedback 有权
公开(公告)号：US10218319B2
公开(公告)日：2019-02-26
申请号：US15368992
申请日：2016-12-05
申请人： Qorvo US, Inc.
发明人： Lars Sandahl Ubbesen , Bjarne Moller-Jensen , Bjarne Petersen , Søren Deleuran Laursen , Michael Nielsen
IPC分类号： H03F1/34 , H03F1/52 , H03F3/19 , H03G7/00 , H03G7/08 , H03G11/00
摘要： Radio Frequency (RF) amplifiers with voltage limiting using non-linear feedback are presented herein. According to one aspect, an RF amplifier comprises an amplifier circuit having an input terminal and an output terminal and a non-linear feedback circuit having an input terminal and an output terminal. The input terminal of the non-linear feedback circuit is connected to the output terminal of the amplifier circuit and the output terminal of the non-linear feedback circuit is connected to the amplifier circuit to reduce the gain of the amplifier circuit when an RF voltage swing present at the input terminal of the non-linear feedback circuit exceeds a predefined threshold. In one embodiment, the output terminal of the non-linear feedback circuit is connected to the input terminal of the amplifier circuit. In another embodiment, the output terminal of the non-linear feedback circuit is connected to a bias circuit of the amplifier circuit.

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